module.exports = function (playerAction) {
  const random = Math.random() * 3

  let computerAction = ''
  if (random < 1) {
    computerAction = 'rock'
  } else if (random > 2) {
    computerAction = 'scissor'
  } else {
    computerAction = 'paper'
  }
  console.log('我出' + computerAction);
  if (computerAction === playerAction) {
    console.log('平局');
    return 0
  } else if (
      (computerAction === 'rock' && playerAction === 'paper') ||
      (computerAction === 'scissor' && playerAction === 'rock') ||
      (computerAction === 'paper' && playerAction === 'scissor')
  ) {
    console.log('你赢了');
    return -1
  } else {
    console.log('你输了');
    return 1
  }
}